Harmonics Controller; Parameterizable Bandstop Filters For Active Infeed Controls In Chassis Format - Siemens SINAMICS S120 Function Manual

2.1.6

Harmonics controller

Harmonics in the line voltage cause harmonics in the line currents.
With the activation of the harmonics controller, the ALM generates a pulse pattern that
contains harmonic components in addition to the fundamental component. Ideally, the Active
Infeed now sets an equally large harmonic voltage to the harmonic voltage on the line side,
and does not consume any power for this harmonic. Despite the harmonic component of the
line voltage, the line current remains almost sinusoidal and does not load the line supply with
additional harmonic currents. However, the specific compensation of voltage harmonics to
improve the line supply quality is not possible.
Example: Setting the harmonics controller
The 5th and 7th harmonics harmonics are to be compensated.
Table 2- 4
Index
[0]
[1]
The phase currents in parameter p0069[0 ... 2] (U, V, W) can be checked using the trace function of
the commissioning tool.
2.1.7

Parameterizable bandstop filters for Active Infeed Controls in chassis format

Parameterizable bandstop filters that can be used to dampen system resonance are
available for the current control loop. The main application for these bandstop filters is in
weak networks in which the resonance point of the line filter can drop to one quarter of the
controller frequency. Resonance effects in oscillating line supplies can be suppressed with
the aid of these bandstop filters.
"Additional closed-loop controls" function module
The bandstop filters are managed in the "Additional closed-loop controls" function module.
Activating the function module
1. Mark the infeed in the project navigator and open the "Properties" context menu.
The "Object properties" dialog then opens.
2. Click the "Function modules" tab.
3. Activate the "Additional closed-loop controls" function module in the function modules
selection with a mouse click.
Parameter r0108.03 indicates whether the function module has been activated.
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Example parameters for the harmonics controller
p3624
5
7
p3625
100 %
100 %
Infeed
2.1 Active Infeed
39